A : In a material medium the speed of a particle can be more than the speed of light in that medium.
R : In the phenomenon of green house effect, low wavelength radiation is allowed to pass but high wavelength radiation is not allowed to pass.

a) Speed of light is constant in vacuum. b) Speed of light depends on the wavelength of light when it passes through a medium. Which one is correct ? or both ?

The speed of light is low, if the __________ of the medium is high.

When a ray of light passes from air medium to denser medium then its speed and wavelength

When light moves from one medium to another (i) the frequency of light remains same and wavelength changes (ii) refractive index of a medium is the ratio of speed of light in vacuum and speed of light in medium (iii) refractive index of a medium is the ratio of wavelength of light in vacuum and wavelength in medium (iv) for denser medium, the value of refractive index is larger

A: The speed of light, sound waves, water waves in a medium is independent of the nature of the source of intensity (so long it is low). R: Speed of the waves in a medium depends on wavelength.